Reflected entropy in BCFTs on a black hole background

Abstract

We obtain the reflected entropy for bipartite mixed state configurations involving two disjoint and adjacent subsystems in two dimensional boundary conformal field theories (BCFT${}_2$s) in a black hole background. The bulk dual is described by an AdS${}_3$ black string geometry truncated by a Karch-Randall brane. The entanglement wedge cross section computed for this geometry matches with the reflected entropy obtained for the BCFT${}_2$ verifying the holographic duality. In this context, we also obtain the analogues of the Page curves for the reflected entropy and investigate the behaviour of the Markov gap.

arXiv comment47 pages, 1 appendix, 18 figures

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